Carpal tunnel syndrome is compression of the median nerve as it passes through the carpal tunnel, a narrow passageway on the palm side of the wrist. It is the most common nerve compression in the body, affecting roughly 4–5% of adults, and one of the most frequent reasons patients are referred for hand surgery.
Most patients describe a slow, gradual onset of numbness, tingling, and occasional sharp pain in the thumb, index, middle, and half of the ring finger. Symptoms classically worsen at night and during activities that hold the wrist in a flexed position, driving, holding a phone, reading.
Anatomy of the carpal tunnel
The carpal tunnel is bordered on three sides by the wrist bones (carpals) and on the palm side by a strong fibrous band called the transverse carpal ligament. Nine flexor tendons and the median nerve share this small space. When the contents swell, or when the ligament thickens, the nerve is the first structure to suffer, pressure on the median nerve produces the classic symptoms.
Symptoms and red flags
In addition to night-time numbness, patients often notice:
- Weakness or clumsiness, dropping objects, difficulty buttoning shirts
- A burning or electric sensation that travels up the forearm
- Hand fatigue with prolonged gripping
- Symptoms that improve briefly when the hand is shaken out (the "flick sign")
- Wasting at the base of the thumb in long-standing severe cases
Persistent numbness that does not come and go, visible muscle wasting at the base of the thumb, or severe hand weakness are signs that the nerve has been compressed long enough to cause damage, and that surgery should not be delayed.
How carpal tunnel is diagnosed
Diagnosis combines the clinical exam with an electrodiagnostic study (commonly called EMG/NCV, electromyography and nerve conduction velocity). The exam often includes provocative maneuvers, Tinel's test, Phalen's test, carpal compression, that reproduce the symptoms when the median nerve is irritated. The EMG/NCV objectively measures how well the nerve is conducting and helps grade severity. Imaging is sometimes required to rule out other diagnoses or unusual causes.
Many patients with carpal tunnel syndrome do not need surgery, and they don't get surgery in Dr. Lee's practice. The first line of treatment is almost always a nighttime wrist splint, sometimes paired with a corticosteroid injection, and an honest conversation about which activities provoke symptoms.
When symptoms are severe, conservative care has failed, there is demonstrable weakness in the thumb, or the EMG shows meaningful nerve damage, Dr. Lee performs endoscopic carpal tunnel release: a minimally invasive technique that delivers the same nerve decompression as traditional open surgery, but through one small incision and with substantially less scar tenderness afterward.
Non-surgical treatment
For mild and moderate carpal tunnel, the following are tried first:
- Nighttime wrist splinting, keeps the wrist neutral while sleeping; often the single most effective non-surgical step
- Activity modification, reducing overuse and repetitive stress, and prolonged wrist flexion/extension during the day
- Corticosteroid injection, reduces tendon inflammation in the tunnel; often diagnostic as well as therapeutic
- Ergonomic adjustments at work, neutral wrist position, supported forearms
- Physical and hand therapy, for select cases
Surgical treatment: endoscopic release
When surgery is appropriate, the goal is straightforward: release the transverse carpal ligament that is compressing the median nerve. The relief delivered by surgery is durable, recurrence is rare.
In endoscopic carpal tunnel release, a small incision is made at the wrist crease, and a thin camera (the endoscope) is introduced into the tunnel. The ligament is then divided under direct visualization with a small blade. Because the palm itself is not cut, patients typically have less scar pain and return to normal hand use faster than with open surgery. The procedure is performed under local anesthesia with light sedation, no general anesthesia is required, and takes approximately 5 minutes per hand.
Recovery timeline
Surgical recovery is faster than most patients expect. The summary:
- Day 0–3Light hand use the same day. Non-removable splint for 1 week for comfort purposes. Elevate the hand above heart level to minimize swelling.
- Week 1Sutures removed. Begin normal daily activities, typing, light cooking, dressing. Avoid heavy gripping or lifting. Hand therapy initiated. The palm can be sore to pressure for 3-4 weeks.
- Weeks 2–4Most patients have returned to office work. Numbness and tingling improve substantially. Scar massage begins.
- Weeks 4–6Return to heavier activities, exercise, manual labor, sports. Scar tenderness fades over the following months. The amount of recovery mostly depends on how severely compressed the nerve was prior to surgery. In severe cases, the nerve may not recover because it was permanently injured.
What patients commonly misunderstand
Three things are worth setting straight:
- Carpal tunnel is not caused by typing alone. Genetics, anatomy, pregnancy, thyroid disease, overuse, and diabetes are all bigger contributors than keyboard use.
- Delay can cost recovery. Severe, long-standing nerve compression may leave permanent numbness or weakness even after a perfect surgical release. If non-surgical treatment isn't working or there is weakness in the thumb, don't wait too long.
- Surgery does not require months off work. Endoscopic release is significantly faster in returning patients to regular activities compared to traditional open techniques. Most patients return to office work within a week and full activity within 4–6 weeks.
This page is general educational content authored by Dr. Lee. It is not a substitute for individual medical advice. Every patient's case is different, book a consultation to discuss yours.